<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
	</body>
	<script>
		 var arrs =[1,2,3,4,5]
		 arrs.forEach(function(value,i,arr){
			 arr[i]*2
			 
		 })
		 console.log(arrs)
	</script>
</html>
